In order to prevent fogging, the 3 mm-thick rear window of an automobile has a transparent film electrical heater bonded to the inside of the glass. During a test, 200 W are dissipated in a 0.567m^2 are of the window when the inside and outside air temperatures are 22°C and 1°C, and the inside and outside heat transfer coefficients are 9 W/m^2*K and 22 W/m^2*K.
1. Determine the temperature of the inside surface of the window.

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Aquick transition of the operating speed of a shaft from its critical speed will whirl amplitude. (a) increase (b) limit (c) not affect (d) zero